Designed for DR300/DR500/DR600/DR800 roller doors, this relay circuit board provides precise motor control with overload protection and efficient heat dissipation for consistent automation. Compatibility: multiinterface design works with home and building automation systems. Installation: front wiring simplifies integration into existing setups. Durability: quality materials and relay technology support multiple operation modes and stable performance under load. Safety: overload protection and effective thermal management reduce motor risk during extended operation. Flexibility: supports several operation modes to fit different door types and usage patterns. Use scenarios Property management firms upgrading multiple buildings to standardized automated doors. Industrial warehouses with cycle roller doors needing reliable, continuous operation. Technicians retrofitting garage or commercial door systems to improve automation and safety.